Thyroid II Profile (TU, T4, FTI, TSH)

Test Code: TD_119

CPT Code(s): 84479, 84436, 84443

$44

Test Details

Alternative Name(s)

2 mL serum from a plain red top tube. Allow sample to clot in an upright position for at least 60 minutes, then centrifuge sample and transfer serum to a plastic transport tube within 2 hours of collection. Clearly label tube as serum from a plain red to tube. Refrigerate. Note: Do not collect samples from patients receiving therapy with high biotin doses (>5 mg/day) until at least 8 hours following the last biotin administration.

Test Includes

T-Uptake
T4 (Thyroxine)
Corrected T4 (FTI)
TSH, Third Generation

Methodology

Roche COBAS electrochemiluminescent immunoassay (ECLIA)

Rejection Criteria

Allow only one freeze/thaw cycle

Reference Range(s)

By Report

Specimen Requirements

Preferred Specimen

Serum separator tube (SST)

Minimum Volume

2 mL serum

Sample Stability

1 day room temperature
1 weeks refrigerated
1 month frozen

Transport Temperature

Refrigerated

Collection Instructions

2 mL serum. Allow SST to clot in an upright position for
at least 30 minutes, then centrifuge sample within 2 hours
of collection. Refrigerate. Note: Do not collect samples
from patients receiving therapy with high biotin doses
(>5 mg/day) until at least 8 hours following the last
biotin administration.